ci.yml in dboard-3.0.0

- old
+ new

@@ -11,13 +11,16 @@
 
     runs-on: ubuntu-latest
 
     strategy:
       matrix:
-        ruby-version: ["3.0", "2.7", "2.6"]
+        ruby-version:
+          - 3.1
+          - "3.0"
+          - 2.7
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Set up Ruby ${{ matrix.ruby-version }}
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby-version }}
           bundler-cache: true # runs 'bundle install' and caches installed gems automatically